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Offline Engr ObaidTopic starter
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« on: April 16, 2010, 03:53:25 am »
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Dear Friend,

Can any body know the exact frequency in the VLF rang which gives maximum response to gold & Silver ,Which are the  most special target in detecting;
mostly I have seen that they are using frequencies like 15 KHz &7 KHz,

Best Regards,

Engr Obaid Waveing

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Offline Christian
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« Reply #1 on: April 19, 2010, 03:09:34 am »
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For Gold 18 KHZ works very well. Higehr frequencies will be more respsonive to smaller objects where lower frequencies are preferable for larger objetcs.

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Offline Engr ObaidTopic starter
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« Reply #2 on: April 19, 2010, 01:18:08 pm »
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Dear Sir,

In  your experience which type of metal detectors  will work deep  PI, VLF , TR or IB.

Also tell me what is the basic difference between the way of working in
 in GPR & PI metal detectors (pulse transmitting & Receiving Technic  )
 

Best Regards,

Engr Obaid

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Offline GoldDigger1950
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« Reply #3 on: April 19, 2010, 04:52:51 pm »
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Quote:Posted by Engr Obaid
Dear Sir,

In  your experience which type of metal detectors  will work deep  PI, VLF , TR or IB.

Also tell me what is the basic difference between the way of working in
 in GPR & PI metal detectors (pulse transmitting & Receiving Technic  )
 

Best Regards,

Engr Obaid


You're an engineer. Go here:

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http://www.geotech1.com/cgi-bin/pages/common/index.pl?page=main&file=main.dat


That should make it easy. Christian is the owner of this forum and not an engineer. I believe he is a software expert though.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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Offline Engr ObaidTopic starter
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« Reply #4 on: April 20, 2010, 12:27:18 am »
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Dear,
 i knew  that Christian is the administrator of this forum,
 generally  i didn't  specifically asked from him, this is a open forum
my main aim is that any  body can tell me about my query ,
actually i want to clear my concept before designing any circuits,
can you tell me about your experience which type of Technic ( PI, VLF, IB , TR) is better to achieve the maximum depth,
 i have already read about GPR & PI metal detector, PI is easy to understand but GPR (RADAR) Technic is still Dilemma  for me.

BR,

Engr Obaid

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Offline GoldDigger1950
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« Reply #5 on: April 20, 2010, 02:29:34 am »
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Quote:Posted by Engr Obaid
Dear,
 i knew  that Christian is the administrator of this forum,
 generally  i didn't  specifically asked from him, this is a open forum
my main aim is that any  body can tell me about my query ,
actually i want to clear my concept before designing any circuits,
can you tell me about your experience which type of Technic ( PI, VLF, IB , TR) is better to achieve the maximum depth,
 i have already read about GPR & PI metal detector, PI is easy to understand but GPR (RADAR) Technic is still Dilemma  for me.

BR,

Engr Obaid


Obaid, depths of detection are simply too unpredictable for it to be a design factor. The distance an object can be detected in the air is one design factor that can actually be measured but depth in the earth depends on too many factors like the size of the object, the molecular composition of the object, the shape of the object, the condition of the object, the soil mineralization, soil moisture, the general composition of the soil and the organic content of the soil. Just to name a few factors.

Technic may be a brand but it's not a design type as far as I know. There have been numerous posts here describing all of the other types but I will summarize a bit for you.

BFO - Beat Frequency Oscillator - Two oscillators are tuned together but offset by a difference frequency that can be heard by the human ear. One of them is protected from environmental exposure while the other has a coil that is moved over substances which can alter its tuned frequency. The alteration is used to vary the tone that you hear indicating the presence of metal in the area of the coil.

VLF/TR - Very Low Frequency/Transmit Receive - Probably the largest design base in use today. A very low frequency, 3kz to 300khz, is transmitted by a coil and any metal in its field will have a flux field set by this field. When the transmitter is turned off, the collapsing field leaves a small charge in the metal that was in the field. If the receiver coil is near enough to sense the collapse of the metal's very tiny field, it will indicate the presence of metal.

IB - Induction Balance - A finely tuned inductive field is set up which when placed near metal detunes the circuit indicating the presence of metal. Very simple design. This is the most common design used in commercial stud finders.

PI - Pulse Induction - A series of pulses are transmitted and between each pulse a receiver senses any changes to the field which might indicate the presence of metal. While this type of detector can function as a discriminating type of machine, that must be done by a microcomputer which takes time to analyze and may result in much slower detection.

GPR - Ground Penetrating RADAR - Just what it sounds like. RADAR pulses are transmitted into the ground and the return echos are interpreted by a computer. This is very, very slow and very inaccurate in that the returns are shadows and bright areas rather than true imaging as in RADAR used in the air. The ground conditions play an enormous part in the effectiveness of this technology and the results are left to the interpretation of experts. Not for the amateur. These machines do not simply detect metal. All objects reflect the echo to some degree so a very complex image is the result of the returns. Hard to use and very difficult to design.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
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« Reply #6 on: April 20, 2010, 02:47:48 am »
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Dear ,

 Thanks a lot,  nice informations

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Offline dima_abusara
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« Reply #7 on: November 15, 2010, 02:52:05 am »
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Very helpful information for me ...... thank you all for asking and answering
 Smiley

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« Reply #8 on: January 16, 2012, 02:37:27 pm »
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It can do the experiments by changing the frequency VLF metal detector with a piece of gold, a lot depends on the size of the target and the depth and mineralization of soil and there are no rules. Many sosta Michelet to know about it and they fell silent when he took to the field.
 some links

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http://www.hobby-hour.com/electronics/metal_detectors.php

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http://www.gi.alaska.edu/~jesse/treasure/misc/howdetector.html


My MXTs run at around 15khz which is good for gold and other small items and it will pick up the minerals/ electricity
in you hand at a couple of inches and my GMT runs at 48khz and it will find gold that small that you have to pan it
to separate it as in the size of a pin prick.
look

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end some interesting pages links enjoy dear friend

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http://www.4shared.com/account/dir/-HE2Y_R8/_online.html#dir=109133039


Posted on: January 16, 2012, 02:23:33 PM
Sorry for my bad English :-

Posted on: January 16, 2012, 02:25:34 PM
Pi detectors with a larger probe 1x1 for deep objects and large areas of VLF detectors for small coins of precious metal but would not miss even bigger targets in the land!
I would not longer story here is the literature you with useful information and projects enjoy ....

4shared.com /file/q7Qzbnyc/Rolf_Wilhelm_-_Das_Kompedium_d.html

4shared.com /file/iqb-p8I1/A_edrin_i_I_Osipov_-_Metallois.html

Open this book to use this program

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http://www.caminova.net/en/downloads/download.aspx?id=1


and this book



4shared.com /file/B5MnQ5wm/A_edrin_-_Novie_Metalloiskatel.html


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Offline xavier
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« Reply #9 on: January 16, 2012, 02:42:07 pm »
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Your bad English is for given but have you noticed that this post was posted in 2010?

Regards Xavier

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So many questions so little time
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